Casing construction for rheostats



E. G. PERKINS.

CASING CONSTRUCTION. FUR RHEOSTATS. APPLICATION FILED IAN. s, 1922.

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I@ C I Putented Nov. 28, 1922.

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Patented Nov. 28, 11922;

` lUNITED STATES p ZEARLG. PERKINS, OF YOUNGSTOWN, OHIO.

CASING CONSTBCTON FOB BHEOSTATS.

Application-tiled January 6, 1922. Serial No. 527,499.

ToaZZ whom` t may Gouwe/111: A y y Be it known that I, EARL (i. PERKINS, a

citizen of the United States, `residing at', Toungstown, in the county of Mahoningand State ofGhio, have invented certain neny and useful Improvements in Casing Constructions for Rheostats, of which the 'lfollowing is a specification. .i

rl"his invention relates to rheostats and the like, and more particularly to a novel casing construction for supporting' and housing the rlieostat unit. -However, while the drawings, specifications and certain claims are prepared with special referencek torheostats, involving resistance coils, the'invention will be equally useful and advantageous in conne'ction with various translating devices, such for instance, as a heating unit involving reactance coils.

i primary object of the invention is to provide a construction that may be easily manufactured and quicklyA assembled, and which affords convenient access to the rheostat unit and the wiring connections between the same and the controller device.

A further object is to provide a novel rlieostat unit adapted to carry the spools for the resistance wires. ln that connection the invention provides a unit which greatly facilitates the assembly and attachment of the connections between the resistance wires and the contacts of the switch-boardas well as the terminal board.

WV ith the above and other objects in view which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

A preferred and practical embodiment of the invention is shown in the accompanying drawings in which f Figure 1 is a side elevation, partly in section, of the improved casing construction.

Figure 2 is a vertical sectional. view taken on the line 2 2 of Figure 1.

Figure 3 is a detail elevation of the resistance spool carrier.

Figure 4 is a detail elevation of one end of the casing. y

Similar reference characters designate corresponding arts throughout the several figures of the rawings. I

The casing or housing constituting the present invention preferably includes the `novel end frame members 11 which are of duplicate formation, thereby materially economizing in manufacture', as only one form or mold is necessary. Therefore, as these members are of identical construction, the description of one will sufiice for both.

As will be observed from Figures 1, 2 and 3,y the said end frames are preferably of substantially rectangular formation, havingk at their lower sides they feet 2 for supporting and attaching the casing in the desired location. The inner edge portion of said ,frame is formed with a rabbeted seat 3V for receiving either the insulating switch-board 4 or terminal board 4, and for the purpose of holding such member in the seat,`the frame may be provided at the corners or other suitable loc-ations with screw threaded sockets for receiving the screws 5 or equivalent fastenings carrying the washers 6. This arrangement makes it possible to easily place and remove the insulating members or boards bysimply inserting or removing the unite and space the opposite end frames l--l in their assembled relation. f

The outer edge of each frame is provid in its top and vertical sides with a rabbeted seat 10 for receiving a Ventilating cover 11, which may be of open or screen-like formation as indicated in Figure 1, and may be held to the end frames by suitable fasteners 12.

The rheostat unit or spool carrier C for the resistance wires preferably consists of a pair of insulating wall members 13 and 111 adapted to receive the supporting rods or elongated bolts 15, the heads 15a and nuts 15b of which engage the outer faces of the wall members thereby to clamp the ends of the insulators or spools 16 against the inner faces thereof as shown in Figure 3. When the wall members .and spools are assembled by tightening the nuts 15b on the supporting rods, a. rigid and conveniently removable carrier unit is provided. As shown in Figure 1 this carrier merely rests loosely upon 1 and replaced without disturbing any ot' the other spools in the general assembly. ln the assembled construction, the wire connections between the resistance coils and the Contact terminals serve to hold the unit" against longitudinal movement, While the cover il serves 'the saine purpose as against vertical or lateral movement.

llrom th foregoing it VWili be apparent that the present constri'xction provides a sini ple and practical casing construction which has many advantaoeous features. By reason or the structural teatures ot the end trames, the insulatingf switch-board and terminal elements l and il may be readily fitted with their contacts and terminals and thereafter conveniently assembled in `the traine. Furthermore, the end 'lirarnesinay be readily connected by the insumthin1 platform 8 and the cover il v-/hich interi it with the proper portions oil' the frame to make a neatly furnished as Well as substantial construction.

Viithout 'further description it thought that the te ires and advantages of the invention will he readily apparent... and it Will be understood that changes in the torni, proportion minor details el construction may Ibe reso 'l to Without departing from the spirit ot the invention orl scope of the appended claims. i

l claim: i l. fr casing` o'l' the ingupright end trames having 'tee/t, en insulating1 pla* rm tween and connectino' supporting ringed be- 'eme/s, and 1 in the open il( insulating terminal boards portions ot said end iframes.

2. A 'easing olfl the class dsserihed, ineluding upright end trainee, an insulating'plat forni tor connecting and spacing` .said end iframes, insulating,y terminal or switch boards detachably fitted in said iframes, and a @over detachably connected tey seid end frames.

8. il. casing oi the class described, including an upright end frame of substantially rectangular formation and provided With described, includ` supporting feet, said frame havinga terminal or switch board receiving seat termed at its inner edge, and a 'cover receiving seat 'formed at its outer edge.

' 4f. A. casing of the class described, including upright end frames oi' duplicate com struction, said frames being arranged reversely to each other and provided with terminal-board receiving seats and cover re Ceiving seats, an insulatingl platform connecting the lower portions or said frames, e, rheostat unit supported on said platform, a coverhaving its ends fitted in the cover receiving` seats or the end iframes, and means for securing the cover to said trames.

5. easing ot' the class described including upright end frames, an insulating platform` arranged between and connecting said trames, terminal boards detachably litt-ed in said frames, a lrheostat unit adapted to rest on said platilorrn, and a cover fitted to said end frames for housing said rheostat unit.

6. A casing ot the class described, ineluding an insulating` platiorin and a rheostat unit adapted to be loosely supported by d platform and includinV opposite end Walls of vvinsulation, insulators Jfor Vthe resistance Wires arranged between said walls,` and clam ino bolts for connecting the end walls ln testimony whereof l hereunto affix my signature in the presence of tivo Witnesses. n EARL G. PERKINS;

llilitnesses Anton MGGINN, W. A. Soen. 

